#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
using namespace std;
int main()
{
    int n;
    cin >> n;
    if (n == 0) cout << 0 << endl;
    else
    {
        cout << 0 << '.';
        for (int i = 0; i < n; i++)
            cout << 0;
        cout << endl;
    }
    return 0;
}